UIScrollView scroll issue for UITextViews - objective-c

Question

I have a form which has multiple textfields and textviews. When keyboad is shown I update scrollview frame to prevent textfields hiding under keyboard.
I did follow this question and implement a similar solution.
It works with uitextfields actually but not for uitextviews.
When keyboard is shown scrollview height's is reduced as much as keyboard height and then scroll to focused uitextfield. But if the focused item is uitextview it just doesnt scroll while height of uiscrollview is reduced.
IB screenshots for my scrollview;
https://www.dropbox.com/s/a1iblh6nsdqy34t/Screenshot%202014-05-30%2021.44.32.png
https://www.dropbox.com/s/o2h8avt5w82r5eo/Screenshot%202014-05-30%2021.45.19.png
Here is the code;
// register for keyboard notifications
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyboardWillShow:)
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyboardDidShow:)
name:UIKeyboardDidShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyboardWillHide:)
name:UIKeyboardWillHideNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(keyboardDidHide:)
name:UIKeyboardDidHideNotification
object:nil];
Notification handler;
-(void)keyboardWillShow:(NSNotification *)n {
if(keyboardUp)
return;
NSDictionary* userInfo = [n userInfo];
// get the size of the keyboard
CGSize keyboardSize = [[userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
const int movementDistance = -keyboardSize.height - keyboardPaddingToScrollView;
const float movementDuration = 0.30f;
int movement = movementDistance;
[UIView beginAnimations: #"anim" context: nil];
[UIView setAnimationBeginsFromCurrentState: YES];
[UIView setAnimationDuration: movementDuration];
CGRect contentSize = self.view.frame;
contentSize.size.height += movementDistance;
[self.view setFrame:contentSize];
[UIView commitAnimations];
}
-(void)keyboardDidShow:(NSNotification *)n {
keyboardUp = true;
NSLog(NSStringFromCGRect(self.view.frame));
}
-(void)keyboardWillHide:(NSNotification *)n {
if(!keyboardUp)
return;
NSDictionary* userInfo = [n userInfo];
// get the size of the keyboard
CGSize keyboardSize = [[userInfo objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
const int movementDistance = keyboardSize.height + keyboardPaddingToScrollView;
const float movementDuration = 0.30f;
int movement = movementDistance;
[UIView beginAnimations: #"anim" context: nil];
[UIView setAnimationBeginsFromCurrentState: YES];
[UIView setAnimationDuration: movementDuration];
CGRect contentSize = self.view.frame;
contentSize.size.height += movementDistance;
self.view.frame = contentSize;
[UIView commitAnimations];
}
-(void)keyboardDidHide:(NSNotification *)n {
keyboardUp = false;
}